Podcast
Questions and Answers
Why do humans create devices to lift and move things?
Why do humans create devices to lift and move things?
- To use more effort
- To reduce friction
- To use less effort or create a greater force (correct)
- To create less force
What is friction?
What is friction?
- The speed of an object
- The resistance between surfaces that come in contact with each other (correct)
- The force needed to move a device
- The energy stored in devices
How can friction be reduced between surfaces?
How can friction be reduced between surfaces?
- By making moving parts loose
- By increasing the amount of surface the parts touch
- By using bumpy or fuzzy surfaces
- By using smooth and hard surfaces (correct)
What creates the force needed to move a device?
What creates the force needed to move a device?
Why do devices use parts to store and use energy?
Why do devices use parts to store and use energy?
What happens when a compressed spring in a winding mechanism is released?
What happens when a compressed spring in a winding mechanism is released?
What is the purpose of simple machines in devices?
What is the purpose of simple machines in devices?
What is the role of moving air and water in devices?
What is the role of moving air and water in devices?
How does reducing friction help in making parts move better?
How does reducing friction help in making parts move better?
Why do loose moving parts have an advantage over tight moving parts?
Why do loose moving parts have an advantage over tight moving parts?
What is the purpose of winding mechanisms in devices?
What is the purpose of winding mechanisms in devices?
Why do designers use a variety of simple machines in devices?
Why do designers use a variety of simple machines in devices?
What happens when an object moves down a slope?
What happens when an object moves down a slope?
How does using smooth and hard surfaces reduce friction?
How does using smooth and hard surfaces reduce friction?
Why do devices need a force to move?
Why do devices need a force to move?
What is the primary reason why humans create devices to lift and move things?
What is the primary reason why humans create devices to lift and move things?
How does reducing friction help in making parts move better?
How does reducing friction help in making parts move better?
What is the effect of an object moving down a slope?
What is the effect of an object moving down a slope?
How do winding mechanisms in devices work?
How do winding mechanisms in devices work?
How can moving air and water contribute to moving parts of mechanisms?
How can moving air and water contribute to moving parts of mechanisms?
What happens when an object moves down a slope, and friction is reduced?
What happens when an object moves down a slope, and friction is reduced?
Why do loose moving parts have an advantage over tight moving parts?
Why do loose moving parts have an advantage over tight moving parts?
What is the main purpose of using smooth and hard surfaces instead of bumpy surfaces to reduce friction?
What is the main purpose of using smooth and hard surfaces instead of bumpy surfaces to reduce friction?
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